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Δ-mass dependence of the M-matrix in the calculation of ${{N\Delta \to NN}} $ cross sections
Ying Cui, Ying-Xun Zhang, Zhu-Xia Li
Published:   , doi: 10.1088/1674-1137/44/2/024106
Within the one boson exchange model, \begin{document}$ \Delta $\end{document}-mass dependent M-matrix and its influence on the calculation of \begin{document}$ N\Delta \to NN $\end{document} cross sections are investigated. Our calculations show that the \begin{document}$ m_{\Delta} $\end{document} dependence of \begin{document}$ |{{p}}_{N\Delta}| $\end{document} and \begin{document}$ |\mathcal{M}|^2 $\end{document} has effects on the calculations of \begin{document}$ \sigma_{N\Delta\to NN} $\end{document}, especially around the threshold energy.
Measurement of the integrated luminosity of the Phase 2 data of the Belle II experiment
F. Abudinén, I. Adachi, P. Ahlburg, H. Aihara, N. Akopov, A. Aloisio, F. Ameli, L. Andricek, N. Anh Ky, D. M. Asner, H. Atmacan, T. Aushev, V. Aushev, T. Aziz, K. Azmi, V. Babu, S. Baehr, S. Bahinipati, A. M. Bakich, P. Bambade, Sw. Banerjee, S. Bansal, V. Bansal, M. Barrett, J. Baudot, A. Beaulieu, J. Becker, P. K. Behera, J. V. Bennett, E. Bernieri, F. U. Bernlochner, M. Bertemes, M. Bessner, S. Bettarini, V. Bhardwaj, F. Bianchi, T. Bilka, S. Bilokin, D. Biswas, G. Bonvicini, A. Bozek, M. Bračko, P. Branchini, N. Braun, T. E. Browder, A. Budano, S. Bussino, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, D. Červenkov, M.-C. Chang, P. Chang, R. Cheaib, V. Chekelian, Y. Q. Chen, Y.-T. Chen, B. G. Cheon, K. Chilikin, H.-E. Cho, K. Cho, S. Cho, S.-K. Choi, S. Choudhury, D. Cinabro, L. Corona, L. M. Cremaldi, S. Cunliffe, T. Czank, F. Dattola, E. De La Cruz-Burelo, G. De Nardo, M. De Nuccio, G. De Pietro, R. de Sangro, M. Destefanis, S. Dey, A. De Yta-Hernandez, F. Di Capua, S. Di Carlo, J. Dingfelder, Z. Dole
Published:   , doi: 10.1088/1674-1137/44/2/021001
From April to July 2018, a data sample at the peak energy of the \begin{document}$ \varUpsilon \left( {4{\rm{S}}} \right)$\end{document} resonance was collected with the Belle II detector at the SuperKEKB electron-positron collider. This is the first data sample of the Belle II experiment. Using Bhabha and digamma events, we measure the integrated luminosity of the data sample to be (\begin{document}$ 496.3 \pm 0.3 \pm 3.0)\;{\rm pb}^{-1}$\end{document}, where the first uncertainty is statistical and the second is systematic. This work provides a basis for future luminosity measurements at Belle II.
Weak deflection angle of extended uncertainty principle black holes
Yashmitha Kumaran, Ali Övgün
Published:   , doi: 10.1088/1674-1137/44/2/025101
In this paper, we have discussed the effects of quantum fluctuations spewed by a black hole on its deflection angle. The Gauss-Bonnet theorem (GBT) is exploited with quantum corrections through the Extended Uncertainty Principle (EUP) and the corresponding deflection angle is obtained. Moreover, we have attempted to broaden the scope of our work by subsuming the effects of plasma medium on the deflection angle as well. To demonstrate the degree of difference, the acquired results are compared with the prevailing findings.
The possible Odderon exchange in pp and ${{\bar{p}p}}$ elastic collisions at the TOTEM experiment
Juan Lu, Li-Juan Zhou, Zhi-Jie Fang
Published:   , doi: 10.1088/1674-1137/44/2/024105
Base on Froissart-Martin theorem, the Regge theory and the possible Odderon exchange, the total cross section \begin{document}$\sigma_{\rm tot}$\end{document} and the ratio of the real-to-imaginary part of the forward scattering amplitude \begin{document}$\rho$\end{document} for \begin{document}$pp$\end{document} and \begin{document}$\bar{p}p$\end{document} elastic collisions in the TOTEM energy region are studied in the FPO model. We consider the contributions from Froissart bound, Pomeron, Reggeon and Odderon exchange terms to the scattering amplitude of \begin{document}$pp$\end{document} and \begin{document}$\bar{p}p$\end{document} elastic collisions. Using the Odderon intercept, \begin{document}$\alpha_{\rm O}(0)=0.5$\end{document}, our theoretical predictions are in good agreement with at the recent results of the TOTEM experiment. The results show that the Odderon corresponding odd elastic scattering amplitude likely exist.
A systematically study of chiral magnetic effects from RHIC BES to LHC energies
Bang-Xiang Chen, Sheng-Qin Feng
Published:   , doi: 10.1088/1674-1137/44/2/024104
By considering the magnetic field response of the QGP medium, we make a systematically study of the chiral magnetic effect (CME), and compare it with the experimental results for the background-subtracted correlator H from RHIC beam energy scan (BES) to LHC energies. The CME signals from our model computations show a centrality trend and beam energy dependence that are qualitatively consistent with experimental measurements of charge dependent correlations. And then, the time evolutions of chiral electromagnetic current from RHIC BES to LHC energies are systematically studied. The dependencies of time-integrated current signal on the wide range of beam energy \begin{document}$ \sqrt{s}$\end{document} with different centralities are investigated. Through our phenomenological analysis, it is found that the time-integrated electromagnetic current maximizes near \begin{document}$ \sqrt{s} \approx 39$\end{document} GeV of collision energy. The qualitative trends of induced electromagnetic current with collision energies are in agreement with from CME experimental results of from RHIC BES to LHC energies.
Semileptonic decays ${{ B}_{ c} \to (\eta_{ c},{ J}/\psi) { l} \bar{\nu}_{ l}}$ in the “PQCD + Lattice” approach
Xue-Qing Hu, Su-Ping Jin, Zhen-Jun Xiao
Published:   , doi: 10.1088/1674-1137/44/2/023104
In this paper, we studied the semileptonic decays \begin{document}$B_c^- \to (\eta_c, J/\psi) l ^- \bar{\nu}_l$\end{document} by employing the PQCD factorization approach, using the newly defined distribution amplitudes of the \begin{document}$B_c$\end{document} meson and the new kind of parametrization for extrapolation of the form factors, and also taking into account the lattice QCD results about the relevant form factors at several points. We found the following main results: (a) the PQCD predictions for the branching ratios of \begin{document}$B_c \to (\eta_c,J/\psi) l \bar{\nu}$\end{document} decays will become a little smaller by about 5%-16% when the lattice input are taken into account in the extrapolation of the relevant form factors; (b) the PQCD predictions for the ratio \begin{document}$R_{\eta_c}, R_{ J/\psi}$\end{document} and the longitudinal polarization \begin{document}$P_{\tau}$\end{document} are \begin{document}$R_{\eta_c}=0.34\pm 0.01, R_{J/\psi}=0.28\pm 0.01$\end{document}, \begin{document}$P_{\tau}(\eta_c) = 0.37\pm 0.01$\end{document} and \begin{document}$P_{\tau}(J/\psi) = -0.55 \pm 0.01$\end{document}; and (c) after the inclusion of the lattice input the theoretical predictions changed slightly: \begin{document}$R_{\eta_c}=0.31\pm 0.01$\end{document}, \begin{document}$ R_{ J/\psi}=0.27\pm 0.01$\end{document}, \begin{document}$P_{\tau}( \eta_c) = 0.36 \pm 0.01$\end{document} and \begin{document}$P_{\tau}( J/\psi) = -0.53\pm 0.01$\end{document}. The theoretical predictions for \begin{document}$R_{ J/\psi}$\end{document} agree with the measured one within errors, and other predictions could be tested in the near future LHCb experiments.
Measurement of differential cross sections and angle-integrated cross sections of the 6Li(n, t)4He reaction from 1.0 eV to 3.0 MeV at CSNS Back-n white neutron source
Huaiyong Bai, Ruirui Fan, Haoyu Jiang, Zengqi Cui, Yiwei Hu, Guohui Zhang, Zhenpeng Chen, Wei Jiang, Han Yi, Jingyu Tang, Liang Zhou, Qi An, Jie Bao, Ping Cao, Qiping Chen, Yonghao Chen, Pinjing Cheng, Changqing Feng, Minhao Gu, Fengqin Guo, Changcai Han, Zijie Han, Guozhu He, Yongcheng He, Yuefeng He, Hanxiong Huang, Weiling Huang, Xiru Huang, Xiaolu Ji, Xuyang Ji, Hantao Jing, Ling Kang, Mingtao Kang, Bo Li, Lun Li, Qiang Li, Xiao Li, Yang Li, Rong Liu, Shubin Liu, Xingyan Liu, Guangyuan Luan, Yinglin Ma, Changjun Ning, Binbin Qi, Jie Ren, Xichao Ruan, Zhaohui Song, Hong Sun, Xiaoyang Sun, Zhijia Sun, Zhixin Tan, Hongqing Tang, Pengcheng Wang, Qi Wang, Taofeng Wang, Yanfeng Wang, Zhaohui Wang, Zheng Wang, Jie Wen, Zhongwei Wen, Qingbiao Wu, Xiaoguang Wu, Xuan Wu, Likun Xie, Yiwei Yang, Li Yu, Tao Yu, Yongji Yu, Jing Zhang, Linhao Zhang, Liying Zhang, Qingmin Zhang, Qiwei Zhang, Xianpeng Zhang, Yuliang Zhang, Zhiyong Zhang, Yingtan Zhao, Zuying Zhou, Danyang Zhu, Kejun Zhu, Peng Zhu
Published:   , doi: 10.1088/1674-1137/44/1/014003
The 6Li(n, t)4He reaction has been measured as the first experiment of neutron induced charged particle emission reaction at CSNS (China Spallation Neutron Source) Back-n white neutron source. Differential cross sections of the 6Li(n, t)4He reaction at 15 detection angles ranging from 19.2° to 160.8° are obtained from 1.0 eV to 3.0 MeV at 80 neutron energy points. Among them, the differential cross sections at 50 energy points below 0.1 MeV are reported for the first time. The results indicate that the anisotropic of the emitted tritons is noticeable above En = 100 eV. Also, the angle-integrated cross sections are obtained). The present differential cross sections agree with the evaluations in general while there are some differences in detail. More importantly, the present results indicate that the cross sections of the 6Li(n, t)4He reaction may be overestimated in most evaluations in the 0.5 − 3.0 MeV region although they are recommended as standard below 1.0 MeV.